Bluejay Diagnostics
BJDX
8 hedge funds and large institutions have $112K invested in Bluejay Diagnostics in 2025 Q4 according to their latest regulatory filings, with 6 funds opening new positions, 1 increasing their positions, 1 reducing their positions, and 2 closing their positions.
200% more first-time investments, than exits
New positions opened: 6 | Existing positions closed: 2
100% more funds holding
Funds holding: 4 → 8 (+4)
0.75% more ownership
Funds ownership: 1.57% → 2.32% (+0.75%)
0% more repeat investments, than reductions
Existing positions increased: 1 | Existing positions reduced: 1
21% less capital invested
Capital invested by funds: $143K → $112K (-$30.4K)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AC
Armistice Capital
New York
|
+$107K |
| 2 |
Citadel Advisors
Miami,
Florida
|
+$68.6K |
| 3 |
Renaissance Technologies
New York
|
+$52.7K |
| 4 |
TSS
Two Sigma Securities
New York
|
+$23.6K |
| 5 |
Geode Capital Management
Boston,
Massachusetts
|
+$16.8K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
DS
DRW Securities
Chicago,
Illinois
|
-$90.8K |
| 2 |
SM
Sabby Management
Miami Beach,
Florida
|
-$45K |
| 3 |
TRCT
Tower Research Capital (TRC)
New York
|
-$26 |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
AC
1
Armistice Capital
New York
| $43.4K | +$107K | +16,250 | New |
|
|
2
Citadel Advisors
Miami,
Florida
| $27.9K | +$68.6K | +10,449 | New |
|
|
3
Renaissance Technologies
New York
| $21.4K | +$52.7K | +8,025 | New |
|
|
TSS
4
Two Sigma Securities
New York
| $9.57K | +$23.6K | +3,588 | New |
|
|
5
Geode Capital Management
Boston,
Massachusetts
| $6.84K | +$16.8K | +2,564 | New |
|
|
TRCT
6
Tower Research Capital (TRC)
New York
| $2.96K | -$26 | -4 | -0.4% |
|
|
LGM
7
L1 Global Manager
Melbourne,
| $226 | +$795 | +121 | New |
|
8
Bank of America
Charlotte,
North Carolina
| $10 | +$7 | +1 | +33% |
|
|
MC
9
Meteora Capital
Boca Raton,
Florida
| $1 | – | – | – |
|
|
DS
10
DRW Securities
Chicago,
Illinois
| – | -$90.8K | -14,942 | Closed |
|
|
SM
11
Sabby Management
Miami Beach,
Florida
| – | -$45K | -7,407 | Closed |
|
BJDX Hedge Fund Activity: Q4 2025 in Review
8 of the 8,256 institutional investors tracked by Wall St. Rank reported a position in Bluejay Diagnostics (BJDX) for Q4 2025, worth a combined $112K — down 21% from $143K a quarter earlier.
Buyers outnumbered sellers: 6 funds opened new BJDX positions and 2 closed out — a net gain of 4 holders — while 1 added to existing stakes and 1 trimmed.
The largest buyer was Armistice Capital, opening a new position worth an estimated $107K. The largest seller was DRW Securities, exiting entirely with an estimated $90.8K sold.
- 8 institutional investors held Bluejay Diagnostics (BJDX) as of Q4 2025, up from 4 in Q3 2025.
- Funds reported $112K of Bluejay Diagnostics stock for Q4 2025, down 21% quarter-over-quarter.
- 6 funds opened new Bluejay Diagnostics positions in Q4 2025 and 2 closed out, a net change of +4 holders.
- The largest Bluejay Diagnostics buyer in Q4 2025 was Armistice Capital, an estimated $107K added.
- The largest Bluejay Diagnostics seller in Q4 2025 was DRW Securities, an estimated $90.8K sold.
Based on aggregated 13F filings for Q4 2025.